Publicação
Caracterização de silício por fotoluminescência e electroluminescência: implementação de um sistema de medida
| Resumo: | There has been an increasing use of renewable energy systems in our planet. Replacing the old energy sources for renewable ones is inevitable. The process has already begun with hydroelectric power plants and wind power plants. Solar energy is extremely vast and free to be consumed and there lies the importance of solar photovoltaic technology with the hope of a fast transition to this type of renewable energy source. The development of solar photovoltaic technology lies on the improved quality of materials processing, which implies the development of improved diagnostic techniques. Characterization techniques based on steady-state luminescence images have recently emerged as powerful, fast and precise tools in the development of high efficient silicon solar cells. A technique, based on luminescence imaging for characterization of solar cells throughout their construction-phases, is presented in this thesis. In order to perform characterization through photoluminescence techniques, an experimental system was developed and together with software routines created with MatLab being capable of processing the images obtained by photoluminescence. To be able to obtain a comparative method with a similar technique, our system underwent some changes so as to allow for characterization via electroluminescence. The MicroWave Photoconductivity Decay (µPCD) was employed as a comparative and validation technique for the determination of minority carrier lifetimes. The results demonstrate that Photoluminescence and Electroluminescence techniques are valid tools in the development and optimization with the benefit of facile integration in an industrial environment. |
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| Autores principais: | Madeira, José Carlos Videira |
| Assunto: | Energia solar Solar fotovoltaico Técnicas de caracterização Fotoluminescência e eletroluminescência Teses de mestrado - 2011 |
| Ano: | 2011 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | português |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | There has been an increasing use of renewable energy systems in our planet. Replacing the old energy sources for renewable ones is inevitable. The process has already begun with hydroelectric power plants and wind power plants. Solar energy is extremely vast and free to be consumed and there lies the importance of solar photovoltaic technology with the hope of a fast transition to this type of renewable energy source. The development of solar photovoltaic technology lies on the improved quality of materials processing, which implies the development of improved diagnostic techniques. Characterization techniques based on steady-state luminescence images have recently emerged as powerful, fast and precise tools in the development of high efficient silicon solar cells. A technique, based on luminescence imaging for characterization of solar cells throughout their construction-phases, is presented in this thesis. In order to perform characterization through photoluminescence techniques, an experimental system was developed and together with software routines created with MatLab being capable of processing the images obtained by photoluminescence. To be able to obtain a comparative method with a similar technique, our system underwent some changes so as to allow for characterization via electroluminescence. The MicroWave Photoconductivity Decay (µPCD) was employed as a comparative and validation technique for the determination of minority carrier lifetimes. The results demonstrate that Photoluminescence and Electroluminescence techniques are valid tools in the development and optimization with the benefit of facile integration in an industrial environment. |
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